Cylinder hone



March 17, 1931. v HALL 1,796,842

CYLINDER HONE Original Filed March 25, 1926 Fig.4

Patented Mar. 17, 1931 ERNEST A. HALL,

OF TOLEDO, OHIO, ASSIGNOR TO THE HALL MANUFACTURING COM- PANY, OF TOLEDO, OHIO, A CORPORATION OF OHIO CYLINDER HONE Original application filed March 25, 1926, Serial No. 1928. Serial This constitutes a division of United States 7 Patent No. 1,696,477,

I 1928, to Ernest A. Lindroth.

For purposesof illustration, and-not ofv limitation, the invention is shown on the accompanying drawings, in which:

Figure 1 is a longitudinal sectional elevation of a cylinder grinding tool or hone;

Figure 2 is a transverse sectional view on the line 22 of Figurel;

Figure 3 is a transverse sectional view on the line 33 of Fig. 1; and

Figure 4 is a fragmentary view in longitudinal section of an alternate form.

The illustrated embodiment of the invention comprises a tool body 1 having a central bore 2 extending longitudinally there- 'through, and having in equidistantly spaced relation around its outer side,longitu dinal apertured bearing bosses 3 extending lengthwise of the body to the body axis. The body 1 is substantially rectangular in cross section, and hasat each corner an extension forming a bearing boss 3 in the form shown. Each boss 3 has a pivot pin elprojecting through its aperture, and a carrier 5 for a stone or abrading member is carried by each pin for transverse swinging movement-s relative to the body. In this instance, the pins 4 project beyond both ends of the respective bearing bosses, and the carriers have arms which engage the pins at the ends of the bosses, these arms being'disposed at the ends of the carriers. The abrading'members 6 are set in channeled portions of the carriers, and are secured therein any suitable manner, as by set screws (not shown)-.;; P W r dated December th, Hall and Gerald J.

with their apertures parallel 97,249. Divided and this application filed July 28, No. 295,890.

A shaft 10 is feathered in the bore 2 of the body 1 to permit it to have axial movements relatively thereto, and to cause the body to rotate therewith. The shaft 10 at each end of the body 1, and within the limits of the respective ends of the carriers 5, is provided with a cone 11, the outer end of which is removably carried by the shaft to permit its removal preparatory to removing the shaft from or inserting it into the body 1. The removable cone, in the form shown, is screwed on the lower extended or outer end portion of the shaft, and is securely held in shouldered engagement with the shaft by a nut 12.

.The two cones 11 face or have their tapers extending in the same direction, and are fixed to the shaft against any relative longitudinal movements. In this instance, the smaller ends of the cones face toward the outer end of the shaft 10.

Each carrier 5, at the inner side of each end thereof, is provided with a tapered boss or projection 13, which opposes and is complemental to the tapered surface of the adja cent cone 11, so that the inward swinging movements of the carriers relative to the body are stopped by the cones, and axial movements of the shaft 10 and its cones will permit either a further inward movement of the carriers, or will cause positive uniform outward movements thereof, depending on the direction of movement of the cones.

The shaft 10 extends outwardly beyond the body 1, and is provided at its outer end in suitable spaced relation with means for attaching it to a motor shaft, drill press spindle, or other suitable driving means. The attaching means. in the form shown, consists of a socket member 15.

Means are provided for effecting a cont-inued outward yielding movement of the carriers 5 during an operationof thetool, where such act-ion is desired, and for this purpose a sleeve support 16 extends outwardly from the body-1, and is internally screw-threaded. Disposed within the sleeve support 16 and surrounding the'drive shaft 10, is a coiled compression spring 17, which bears at one endagainst the end of the adjacent cone 11. A nutor sleeve 18 is externallyscrew-threaded, and is screwed into the sleeve support 16, bearing against the opposite end of the spring 17.

It is to belunderstod thatwhen the abrading portion ofthe tool is inserted into a cylinder to be ground, and the nut 18 adjusted to compress the spring 17 and cause an outward grinding pressure of the abrading members against the cylinder wall, the rotary grinding action of the tool will continueuntil a predetermined part of the surface of thewallhasbeen remoyed the spring func tioning until the abrading membershave been extended to such a degree that the pressure of the sp" ng has been compensated for. filthen it ,i desired to remove but a small part ofqthe cylinder wall the spring pressure is relieved accordingly, it beingmani test that ;the eompression of the springdetermines the amount the surface wall to be removed.

In the, alternate form shown on, Fig. .4, the sleeve. support 16 extends outwardly from itliebedy 1,,but instead of being internally screwtln'eaded;substantially .its. entire scg lengtln as in theformshown in, .Eig. l, the 11131381 portion only: iscscrew threaded. .In threatled engagement with the-screw threaded portion ofqthe support 16 is anelongate Tglandnut 19, theinner end of which is adapted t0;.bear ,against the outer end ofthead- ;j aeent (cone 11. When thisnut is turned downwithits lower end in engagement with the cone 11,,it isevident .-that ,,inward,axial movement of the shaft lOisprevented so that the tool willnot grind .the cylinderwall to a .,,gre'ater diameter thanwthatfior \Vl'llCh the v stones or abrading elements Gare originally et, because there isno ,proyisionforpermit ting the abrading elements to receive a yieldv-;, ,.,ingoutward press re. to continue,thegr nding action. beyont 1, the point. for wl1i ch the conesv are .set.

In this form, provision is alsmmade for securing a, continued outward yielding inoye- 4.5 ,ment of the carriers by meansof, a coilspring 17, which is dispesedwithin the gland ,nut

19,, and; bears at one end against the outer end of theadjacent cone. A nut l8 in threaded engagement-with the screw threadm ed bore of thcslecve nut '19. ,Ashereinbefore described, the nut '18 may be adjusted to vary the tension on the spring 17? .toexcrt. a yielding outward pressure on theabradingelement 6 when the tool is moved.longitudinally in one-direction.

Inboth forms aboye described, it is appar ent that movement of-the tool intothe' cylinder to be ground causes the .OlltXEl-ldjGXfiQIl- Sign ofthe abrading elem that whenthesleeve niit i9 isturned'down to t 6 due to the directiongof taper-of the cones ll -bnt-qnove- V ment-of the tool inthe-opposite direetien reylier ith L e i' ilepr e ..e th ;,jabli i e; elem nt i i prer 1 engage the cone 11, no expanding of the abrading elements takes place.

In practice, it is desirable, when first tru- .ing a cylinder, to apply the spring expanding action to the abrading elements 6 so that the grinding will continue until a predetermined initial portion of the cylinder wall hasbeen removed. WVhenLthe cylinder has .been ground in ithismanner to substantially the diameter desired, the spring tension is --relieved and the stop sleeve or sleeve nut 19 turned downto give a positive set adjustment .4 to the abra din g members. so as to surface and accurately grind the cylinder in the manner desired.

clYhilc Lhavedescribed my ,improyed tool in more or less detail, to comply with the ,.requiren entsof the statute, it is nevertheless desired that this detaileddescription be considered merely as illnsti v and not as lim- ,.iting,.a1nl.itis to be understood. that changes .and noditi ens may be made by 5 those skilled .in this art without departing from the invention as defined in .the pending claims.

lVhat I claim as new andjdesire' to secure ,thereto, a pairpf corresponding cones car rieddnfixed spaced relation by the shaft and facing in the samedirection, elongate abradiing stone, carriers carried by the body in spa-ced relati onaround the same and with their, longitudinal axes; disposed lengthwise of the shaft, each of said cones having c0- ,action with s aid carriers, whereby anyfmovement of the shaftin one direction willin'ipart like outward movements to both endsof the carriers, tension means bearing directly against one of said cones, a housing fixed to said body and enclosing said'tension means, and an, elementadjustable in said housing providing an abutment for the opposite end of saidtension means for regulating the s m i 2.: In a tool of .the class described, a rotatable body, a shaft fordrivin said body and capable .of limiting axial movements relatively thereto, apairof corresponding cones carriedin fixed'spaced relation by the shaft ,and' facing' in the same direction, elongate V abrading stone carriers carried by the-body in spaced-relation around the sameand with jtheir longitudinal axes disposed lengthwise of theshaft, each ,of said cones having coaetion with said carriers whereby any movement of the shaft in one direction will im- Qfpartlike outwardmovements to both-ends of @the carriers, agsleeve on said body; tension means Within said sleeye acting onsaidshaft andbody for yieldin'gly opposinga moveent of the 'shaftinone"direetion relative to the body, an adj ustable elementiin said sleeve operable to limitposit-ively to anypmdeten mined extent the movement of the shaft in one direction relative to the body, and a member within said element for adjusting the pressure exerted by said tension means.

3. In a tool of the class described, a body, a plurality of abrading stone-holding members carried by the body for swinging movements transversely thereof and each having longitudinally spaced surfaces, a shaft in driving connection with the body and adapted to have limited axial movements relatively thereto, said shaft having tapered portions which are fixedly spaced axially thereof and facing in the same direction for coaction with said longitudinally spaced surfaces of the stone-holding members, a sleeve on said body, a member in said sleeve in threaded engagement therewith, spring means within said sleeve coacting with said member and body to effect a predetermined yielding adjustment of said shaft and body, and means coacting with said shaft and body for effecting a predetermined positive set adjustment of the shaft and body. 7

4. In a tool of the class described, a body, an abrading stone holding member carried by the body for transverse swinging movements relative thereto, a shaft extending axially through said body in driving engagement therewith, a fixed portion on said shaft receiving the inward thrust of said abrading member and adapt-ed to cause positive outward adjustment of the abrading member upon movement of the shaft in one direction, a housing on said body, a coiled spring within said housing and bearing against said body, a sleeve threaded into said housing to form a positive stop for limiting the movement of said shaft in one direction, and an element in threaded engagement'with said sleeve and engageable with said spring for adjusting the tension thereof.

5. In a tool of the class described, a body, a plurality of abrading elements, means connecting said abrading elements to said body for outward swinging movements transversely thereof, a shaft extending axially through said body, means coacting with said shaft and body for effecting outward adjustment of said abrading elements upon axial movement of said shaft in one direction, a sleeve support extending from said body, adjustable tension means within said support for yieldingly opposing movement of said shaft in one direction relative to the body,

and adjustable means Within said support to limit positively to any predetermined extent movement of the shaft in one direction relatively to the body.

6. In a tool of the class described, a body, a plurality of abrading elements, means connecting said abrading elements to said body for outward swinging movements transversely thereof, a shaft extending axially through said body, means coactin'gwith saidshaft and body for effecting outward adjustment of said abrading elements upon axial movement of said shaft in one direction, a sleeve support on said body, and adjustable means within said support to limit positively to any predetermined extent movement of the shaft in one direction relatively to the body.

7. In a tool of the class described, a rotatable body, an elongate abrading member carried by the body for outward movements relative to its axis, drive means movable lengthwise of the body and abrading member and having a fixed portion receivingthe inward thrust of the abrading member and, when moved in one direction lengthwise of the abrading member, causing an outward positive adjustment thereof, a housing secured to said body and extending outwardly therefrom, a coiled spring in said housing bearing directly against said fixed portion, and an adjustable abutment member carried by said housing for the opposite end of said spring.

In testimony whereof I have hereunto signed my name to this specification.

ERNEST A. HALL. 

